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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71015f6096d21f94cad15848e7a2e64c41846d6c62e5261c17294adfbca3094' 
  AND token = 'rzVzVYVYbgGWXBdgR69oIQOjaOvLDgD7nkcRSHsP/Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}